Research Article
Silica Nanoparticle Coating of NaYF4:(Yb3+, Er3+) Upconversion Phosphor
Figure 4
XPS spectra of the respective elements of NaYF4:(Yb3+, Er3+) phosphor with respect to SiO2 concentrations. (a) The survey scan, (b) Si 2p, (c) O 1s, (d) Na 1s, (e) Y 3d, and (f) F 1s XPS spectra.
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